var value;
// identifiers: variable and parameter
var x1;
x1 = value;
function fn1(x2) {
    x2 = value;
}
// property accesses
var x3;
x3.a = value;
x3['a'] = value;
// parentheses, the contained expression is reference
(x1) = value;
function fn2(x4) {
    x4 = value;
}
x3.a = value;
x3['a'] = value;
